TRAPPIST-1, also designated as 2MASS J23062928-0502285, is an ultra-cool dwarf star that is slightly larger, but much more massive than the planet Jupiter, located 39.5 ly (12.1 pc) from the Sun in the constellation Aquarius. As of February 2017, the dwarf star has been shown to host seven temperate terrestrial planets, a larger number than detected in any other planetary system.